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Loans and allowance for credit losses - Financial Effect of TDRs (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 18 | 12 | 9
Pre-modification outstanding recorded investment | $ 9,516 | $ 7,657 | $ 1,340
Post-modification outstanding recorded investment | 9,516 | 7,658 | 1,340
Charge offs and specific reserves | $ 0 | $ 115 | $ 0
Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 5 | 3 | 2
Pre-modification outstanding recorded investment | $ 2,257 | $ 3,204 | $ 887
Post-modification outstanding recorded investment | 2,257 | 3,204 | 887
Charge offs and specific reserves | $ 0 | $ 0 | $ 0
Construction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan |  | 2 |
Pre-modification outstanding recorded investment |  | $ 1,085 |
Post-modification outstanding recorded investment |  | 1,085 |
Charge offs and specific reserves |  | $ 0 |
Commercial real estate: | Owner occupied |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 7 | 2 | 1
Pre-modification outstanding recorded investment | $ 2,794 | $ 1,494 | $ 143
Post-modification outstanding recorded investment | 2,794 | 1,495 | 143
Charge offs and specific reserves | $ 0 | $ 0 | $ 0
Commercial real estate: | Non-owner occupied |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 2 | 1 |
Pre-modification outstanding recorded investment | $ 3,752 | $ 1,366 |
Post-modification outstanding recorded investment | 3,752 | 1,366 |
Charge offs and specific reserves | $ 0 | $ 106 |
Residential real estate | 1-to-4 family mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 3 | 2 | 1
Pre-modification outstanding recorded investment | $ 618 | $ 175 | $ 249
Post-modification outstanding recorded investment | 618 | 175 | 249
Charge offs and specific reserves | $ 0 | $ 0 | $ 0
Residential line of credit |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan | 1 | 2 |
Pre-modification outstanding recorded investment | $ 95 | $ 333 |
Post-modification outstanding recorded investment | 95 | 333 |
Charge offs and specific reserves | $ 0 | $ 9 |
Consumer and other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of loans | loan |  |  | 5
Pre-modification outstanding recorded investment |  |  | $ 61
Post-modification outstanding recorded investment |  |  | 61
Charge offs and specific reserves |  |  | $ 0

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